Professor Quirinus Quirrell
Chocolate Frog Cards: The Circe — on the first step down, on the right part of the step.
Galleons: one on the landing directly in front of you, between the poles
You can make the visor open and close by clicking the helmet of the suit of armor at the bottom fo the stairs.
Pottermore Books: Hogwarts: A History — at the bottom on the windowsill.
Practice your first potion.
Collect your first Potion Ingredients.
1) Wolfsbane — located at the bottom of the barrel outside Hagrid’s door.
2) Dried Billywig stings — located in the window to the right.
3) Dried nettles — hanging from the eaves to the left side of his hut.
Chocolate Frog Cards: Paracelsus — to the right of that barrel
Zoom in to Hagrid’s door, click on the paper and read about the Gringotts’ break-in.